Protection against eavesdropping of computer rooms and the isolation of indoor EMC test sites from the environmental RF disturbances requires use of broad band power line filters.
T-Network Ltd. developed its series of power line filters with the following main technical performances:


P stands for 60 dB attenuation at 25 kHz.
D stands for distributed load connection on the output.

Current load relatates to 55C ambient temperature.
Filtered lines within the three phase filters are: L1, L2, L3, N.
The housing of the filters is made from aluminium.

See an example for the usual assembling of power line filters (NPS3x25/100D): vector graphic (wmf,*.doc) or high resolution gif